My ex wants to take our child on vacation causing her to miss 3 days of school. Can he do this against my wishes?

My ex husband wants to take our daughter on vacation causing her to miss 3 days of school. Can he do this against my wishes? My daughter's science fair project and presentation is due on one of the days she will be out. My ex seems to think that her teachers have to accommodate him and my daughter just because he wants to go on vacation. My daughter told her father that she did not want to miss school the day her science fair project is due, but he plans for her to miss that day anyway. Can I legally stop him from taking her out of school for vacation?